@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestSingleParam {
 String value();

 boolean required() default true;

 String defaultValue() default "";
}

public class RequestSingleParamHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
 @Override
 public boolean supportsParameter(MethodParameter parameter) {
  return parameter.hasParameterAnnotation(RequestSingleParam.class);
 }


 @Override
 public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
         NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
  RequestSingleParam requestSingleParam = parameter.getParameterAnnotation(RequestSingleParam.class);
  HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
  BufferedReader reader = request.getReader();
  StringBuilder sb = new StringBuilder();
  char[] buf = new char[1024];
  int rd;
  while ((rd = reader.read(buf)) != -1) {
   sb.append(buf, 0, rd);
  }
  JSONObject jsonObject = JSONObject.parseObject(sb.toString());
  String value = requestSingleParam.value();
  return jsonObject.get(value);
 }

}

@SpringBootApplication
@EnableWebMvc
public class SpringbootDemoApplication extends WebMvcConfigurerAdapter {

 public static void main(String[] args) {
  SpringApplication.run(SpringbootDemoApplication.class, args);
 }

 @Override
 public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers){
  argumentResolvers.add(new RequestSingleParamHandlerMethodArgumentResolver());
  super.addArgumentResolvers(argumentResolvers);
 }
}

 @RequestMapping(value = "/test",method = RequestMethod.POST)
 public void test(@RequestSingleParam(value = "name") String name){
   System.out.println(name);
 }